Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/3851
Thanks for the reviewing. @fhueske Move the check logic from `rule` into
`Table API validation` phase make sense to me. That is `Table API validation`
ensure the `Semantics` and `rule` ensure the `Runtime` can deal with the
situation. The PR. is updated. :)
Thanks,
SunJincheng
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